【摘要】 提出了一种基于数字图像二阶方向导数的激光光斑图像增强方法,通过局部光环方向角及二阶方向导数的计算来对光环进行检测,并进行二值化处理.在像素亮度二阶方向导数计算的近似上使用了小平面模型,并对邻域的大小做了定性的描述,以提高近似精度.最后用实际激光光斑图像对提出的方法进行验证表明:无论精度和稳定性都达到设计要求.更多还原

【Abstract】 A novel approach of laser facula image enhancement and binary representation is presented, which relies on detecting aureole as image regions where the second directional derivative of the digital image is positive. A facet model is used to approximate the derivatives at each image pixel based on the intensity values of pixels located in a certain neighborhood. A qualitative description is given to increase the precision of the approximation. The approach is validated by the practical laser facula image.更多还原